Timing chain does not affect turning over. Every engine has a timing chain or belt. If the chain/belt fails, the valves will not be timed to the crankshaft and the valves could hit the pistons. Car may turn over but will not start. Does the engine turn over but not start? If it does not turn over at all, the problem is with the starter/solenoidTiming chain does not affect turning over. Every engine has a timing chain or belt. If the chain/belt fails, the valves will not be timed to the crankshaft and the valves could hit the pistons. Car may turn over but will not start. Does the engine turn over but not start? If it does not turn over at all, the problem is with the starter/solenoid

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It is acually called the vehicle speed sensor I do believe. It should should be located on the top of your transmission with a wiring harness attached to it. It should also have 1 bolt holding it in also. Whatever you do, do not rotate the gear when you remove it. Try to mark the exact way it came out when you replace the sensor. When you pull the sensor out it will have this gear attached to it which will need to be placed into the new sensor and put back into the vehicle in the same way it came out or you will throw a code and it will not be pretty. Good luck, hopefully I didn't scare you it can be a simple repair just mind your P's and Q's.

Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

What exactly is the "round plug type thing" near the firewall [passenger side]? Is it a sensor of some type? I, too, have a coolant leak here on my 2001 Durango; its tucked in rather tightly near the hood/firewall corner. My electric fan is not kicking on; vehicle overheated tonight. (4.7 liter)

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I Assume you have a 4.7 liter V8, have you taken the chains or gears off yet, if so, did you line everything up before disassembly and lock the gears with a locking fixture and chock the chains in the guides? yes, all the dots and marks matter. it is an interference engine which means if the cams are out of time with the crankshaft, severe valvetrain/piston damage can result when started. get out the manual and go over all the marks and be absolutely sure everything is exactly lined up before trying to start. turn the engine over by hand at least 2 full revolutions to check for interference , then recheck all timing marks again. before cranking with the starter motor. timing is critical on the 4.7, if its off, bad thing can happen, please take your time and be careful

There is a cube relay next to the fuses for the ignition. If it goes bad the engine will turn over, but it will not start. There are two large (~1"x1"x1") relays next to each other. One is for the electric radiator fan relay and one for the ignition relay. When my ignition relay went bad and I switched the two...the engine turned over but would not start. This does not explain the other issues, but who knows they may not be related.

You have a break caliper tied up and or the break hoses are bad and not leting the fluid flow back to the resavor. I just got done with my wifes 2001 Durango. New rotors, calipers, pads, and front break hoses, This makes 3 times in the last 3 years i had to put calipers on it. This time i put break hoses on to, was told by reliable sourses thats what the problem is break hoses i took no chanses i did the whole thing.